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#1 |
Badcaps Veteran
Join Date: Jul 2011
City & State: Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 2,607
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![]() I bought this switching supply power a few months ago but did not have time to do anything but now because of being in between jobs I now have time for projects that were waiting for me to have time to do them
What do think about this switching power supply pictures are below One note theses pictures are after I had recap this power supply The capacitors were actually not that bad ESR value wise expect for a couple of them low UF value under 100 for non brand name capacitors One other note I moved the indicator LED light to the outside of the enclosure so I can see it better One final note which is a little strange for switching power supply I have worked with the inrush current is higher to trip my electronic fuse controller the maximum current for this controller is 5 amps The inrush current at startup is 4.75 amps with no load on the power supply If anyone is interested in this switching power supply I will post a link where you can buy one
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9 PC LCD Monitor 6 LCD Flat Screen TV 30 Desk Top Switching Power Supply 10 Battery Charger Switching Power Supply for Power Tool 6 18v Lithium Battery Power Boards for Tool Battery Packs 1 XBox 360 Switching Power Supply and M Board 25 Servo Drives 220/460 3 Phase 6 De-soldering Station Switching Power Supply 1 Power Supply 1 Dell Mother Board 15 Computer Power Supply 1 HP Printer Supply & Control Board * lighting finished it * These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10% 1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later ) 2 Hem Saw Computer Stack Board All of these had ![]() All of the mosfet that are taken out by bad caps ![]() Last edited by sam_sam_sam; 11-20-2020 at 10:06 AM.. |
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#2 |
Great Sage 齊天大聖
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 24,417
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![]() the inrush shows that the primary caps have some capability!
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#3 |
Badcaps Veteran
Join Date: Jul 2011
City & State: Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 2,607
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![]() Thanks
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#4 | |
master hoarder
Join Date: May 2008
City & State: VA (NoVA)
My Country: U.S.A.
Line Voltage: 120 VAC, 60 Hz
I'm a: Hobbyist Tech
Posts: 10,296
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![]() Quote:
First, the PCB design looks pretty sloppy - hard to tell where the separation is between primary and secondary. Pretty sure this one won't pass UL tests either. Next, I can't quite tell the capacity of the primary caps, but looks like 680 uF. If that's the case, I'd say the output will probably become very limited around 350 Watts... maybe 400 with some luck. The label claims 20 Amps max at 24V. That's 480 Watts of output power. I have my doubts this Chinese design will do it without popping. ![]() On the plus side, this looks like a Half-bridge design, but done with MOSFETs. I wonder what kind of efficiency this PSU will get and if there is any improvement over regular BJTs (there should be, I think.) |
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#5 |
Badcaps Veteran
Join Date: Dec 2010
City & State: Alberta
My Country: Canada
Posts: 1,997
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![]() It looks fine, the variable voltage and current would be really useful.
They put the earth-ground trace between the pri and sec, so that helps the pcb spacings. It has minimal EMI filtering and the smallish output capacitors at 20A ripple? But derate it to less than 500W chinese watts... Usually at 500W power level I am seeing a soft-start (relay) instead of a big NTC because they get hot. But this has a cooling fan. True test would be charging a car battery. |
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#6 |
Badcaps Veteran
Join Date: Jul 2011
City & State: Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 2,607
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![]() Momaka and Redwire
You both have brought some testing that I going to do on this switching power supply maybe in the next couple of days Thanks for your feedback I have a power supply tester that I going to use on it and slowly increase the current load and see what it can handle and still keep the voltage that it is set to I do want to see what it can handle because I would like to use it as a battery charger for Lithium Ion Battery types and nicad type and maybe sla type so I do need to know just how much abuse it can take If I can remember correctly but I think I have shorted the power supply leads together and all it does is shutdown but I am not sure if I have done it this power supply yet or not but I think if I have not done this yet I might have a light bulb in series and do this test to begin with Last edited by sam_sam_sam; 11-21-2020 at 05:32 AM.. |
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#7 |
Badcaps Veteran
Join Date: Jul 2011
City & State: Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 2,607
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![]() Update to this switching power supply case
I was not a big fan about the open end where the main power supply input are so ( even with the plastic cover over the terminals ) [ the volt/amp meter module not in a very convenient place for where and how I would like to read the display] I have taken a plastic enclosure and cut it to fit the front of power supply input and have the input outlet from an ATX power supply enclosure and a on/off switch moving the volt/amp meter to the plastic enclosure and also put banana jacks for the output voltage One note I remove the terminal block that was on the switching power supply board So it more user friendly for how I want to use it When I finish the modification to this switching power supply project I will post some pictures of it Last edited by sam_sam_sam; 03-04-2021 at 07:46 PM.. |
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#8 | |
Badcaps Veteran
Join Date: Jul 2011
City & State: Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 2,607
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![]() Quote:
Hopefully I will not see this ![]() Last edited by sam_sam_sam; 03-04-2021 at 08:19 PM.. |
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